Rutsey was on the first Rush album (which includes their first big tune Working Man), before he quit the band because he didn't want to tour and had musical differences with the others.
Neil Peart soon joined and the rest is Rushtory.
Over the years I became curious whatever happened to Rutsey. I ran into this interview with Alex Lifeson, who talked a bit about Rutsey on Rockline:
In a 1989 Rockline interview, Alex Lifeson remarked, "John's still around. I see John quite often. He gave up playing shortly after he left the band and went into bodybuilding. He competed on an amateur level for a while, doing that for a few years, and has sort of been in and out of that, but he still works out, and I work out with him a few times a week at a local gym - at a Gold's, here in Toronto."
In a later interview in the 90s, Alex said he didn't hang out with Rutsey anymore but didn't say why.